How the due date is calculated
Canine gestation averages 63 days from the day of breeding. Enter June 26, 2026 and the calculator returns a due date of August 28, 2026. Most healthy litters arrive within 58–68 days, so treat the result as the center of a short window rather than an exact day.
Sperm can survive several days in the reproductive tract, so conception may happen after the mating itself — that is why a range exists rather than a single day. If you had progesterone testing done, counting 63 days from ovulation is considerably more precise than counting from the breeding date.
Worth having open at the same time: the dog age calculator.
Signs whelping is near
In the final day or two a dog's body temperature often drops below 100°F, she may stop eating and start nesting. Have a quiet whelping box ready in advance. After the puppies grow, estimate their adult size with the puppy weight calculator.
Litter size matters too: large litters often arrive a day or two early, while a single puppy may go slightly over. A drop in rectal temperature below 100°F usually means whelping will begin within about 24 hours, so start taking it twice daily from around day 58.
Keep the days until date calculator nearby for the rest of the same job.
How to use this calculator
Pick the breeding date and read the estimated due date instantly. For cats, use the cat pregnancy calculator instead.
Enter the first breeding date for the earliest likely day and the last for the latest, then plan to be at home across that whole window.
Frequently asked questions
- How long are dogs pregnant?
- About 63 days on average, with a normal range of roughly 58 to 68 days from breeding.
- When is a dog bred June 26, 2026 due?
- Around August 28, 2026 — the breeding date plus 63 days.
- Why is there a range, not one date?
- Conception may not happen on the exact breeding day, and gestation length varies slightly between dogs.
- Should I see a vet?
- Yes. A vet can confirm pregnancy and count puppies, which helps you know when whelping is complete.
- When should I call a vet during whelping?
- Call your vet if strong contractions last more than 30 minutes with no puppy, if more than two hours pass between puppies, or if she is past day 68. Whelping problems escalate quickly, so have the number ready in advance.